Gregory Scarpa

https://en.wikipedia.org/wiki/Gregory_Scarpa

Gregory Scarpa (May 8, 1928 – June 4, 1994), nicknamed the Grim Reaper and also the Mad Hatter, was an American caporegime and hitman for the Colombo crime family, as well as an informant for the FBI. During the 1970s and 80s, Scarpa was the chief enforcer and veteran hitman for Colombo boss Carmine Persico. He was sentenced to life in prison in 1993 for three murders, and died on June 4, 1994.